# NTSB DFW07CA091: Cessna 320C, N3022T, McKinney, TX, April 13, 2007 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: April 13, 2007, 14:59 local (19:59 UTC) - Place: McKinney, TX - Coordinates: 33.178054, -96.590553 - Nearby events: https://openairdocs.org/map.md?lat=33.1781&lon=-96.5906&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report June 27, 2007 - Report: Approved by Office Director - Parties: FAA FSDO - NTSB case key (mKey): 65576 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DFW07CA091 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/65576/pdf - Page: https://openairdocs.org/ntsb/DFW07CA091 ## Probable cause The collapsed of the right main landing gear as result of the failure of the over center down lock. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Gear collapsed, landing - roll - landing gear,gear locking mechanism - failure (cause) - aircraft control - not possible, pilot in command - On ground/water encounter with terrain/water, landing - roll - terrain condition - ditch ## Analysis The 24,355-hour airline transport pilot was conducting an instructional training flight with a 30,000-hour airline transport pilot performing touch and go landings to Runway 17 in a light twin-engine airplane. During the landing touchdown to the 7,000-feet long, by 100-feet wide asphalt runway, the right main landing gear collapsed. The flight instructor reported in the NTSB Form 6120.1 (Pilot/Operator Aircraft Accident/Incident Report) that immediately after touchdown on the runway, the "right side slowly lowered." The pilot receiving instruction was on the controls and announced "something is wrong" and both pilots immediately applied full left aileron and left brake to limit the right yaw. The aircraft departed the runway on the right side onto the grass and a shallow ditch before coming to a stop with the right gear collapsed and nose and left gear down and locked. The aircraft sustained structural damage to the right wing and right horizontal stabilizer and both occupants were able to egress the airplane unassisted. Neither pilot was injured. A post-accident inspection of the wreckage by a Federal Aviation Administration inspector revealed that the right landing gear over-center down link lock failed on touchdown. The weather at the accident site was reported as wind from 100 degrees at 9 knots, overcast skies at 2,000 feet, 10 miles visibility, and a barometric pressure setting of 29.70 inches of Mercury. ## Factual narrative The 24,355-hour airline transport pilot was conducting an instructional training flight with a 30,000-hour airline transport pilot performing touch and go landings to Runway 17 in a light twin-engine airplane. During the landing touchdown to the 7,000-feet long, by 100-feet wide asphalt runway, the right main landing gear collapsed. The flight instructor reported in the NTSB Form 6120.1 (Pilot/Operator Aircraft Accident/Incident Report) that immediately after touchdown on the runway, the "right side slowly lowered." The pilot receiving instruction was on the controls and announced "something is wrong" and both pilots immediately applied full left aileron and left brake to limit the right yaw. The aircraft departed the runway on the right side onto the grass and a shallow ditch before coming to a stop with the right gear collapsed and nose and left gear down and locked. The aircraft sustained structural damage to the right wing and right horizontal stabilizer and both occupants were able to egress the airplane unassisted. Neither pilot was injured. A post-accident inspection of the wreckage by a Federal Aviation Administration inspector revealed that the right landing gear over-center down link lock failed on touchdown. The weather at the accident site was reported as wind from 100 degrees at 9 knots, overcast skies at 2,000 feet, 10 miles visibility, and a barometric pressure setting of 29.70 inches of Mercury. ## Aircraft - Registration: [N3022T](https://openairdocs.org/deregistered/N3022T-2017-02-28), registration cancelled 2017-02-28, S/N 320C0022, built 1964 (OpenAirDocs) - Reported make and model: Cessna 320C - Registry model: [Cessna 320C](https://openairdocs.org/model/cessna-320c) (registry code 2074510) (OpenAirDocs) - Registry engine: [Continental TSIO-470 series](https://openairdocs.org/engine/continental-tsio-470-series) (registry code 17047, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 320C0022 - Airframe hours: 5211 - Engines: Teledyne Continental TSIO-470-D 260 horsepower reciprocating; Teledyne Continental TSIO-470-D 260 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: General Shelters of Texas S.B.Limited - Airworthiness certificate: Standard, Normal - Last inspection: Annual, August 1, 2006 - Departed: KGYI, Sherman, TX - Destination: KTKI, McKinney, TX - Airport: KTKI, Collin County Regional Airport, runway 17, 7,000 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 75; injuries: none; flight instructor, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review May 1, 2006; seat: right; flight hours: 24,355 total, 100 in this make and model, 20,000 as pilot in command, 90 in the last 90 days, 30 in the last 30 days, 5 in the last 24 hours - Pilot; age 58; injuries: none; airline transport; airplane ratings: single-engine sea, single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, with waivers/limitations; last flight review October 1, 2006; seat: left; flight hours: 30,000 total, 4 in this make and model, 26,000 as pilot in command, 240 in the last 90 days, 94 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 100° at 9 knots - Visibility: 10 statute miles - Lowest ceiling: 2,000 ft overcast - Temperature: 63 °F, dew point 55 °F - Altimeter: 29.70 inHg - Observed at: KTKI ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20070413006129A](https://openairdocs.org/incident/20070413006129A), Apr 13, 2007: Cessna 320C, Mc Kinney, TX, Substantial damage. (-23) At 1459 local, N3022T was cleared for touch and gos on R17 (gear down and locked and green, nose wheel down, normal in mirror). After touch down PIC… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.